On Sun, 2003-06-15 at 03:34, Edward Maloney wrote:
> I am desperately seeking the ability to record my modem data transmissions
^^^^^^^^^^^^^
If it's your own modem we're talking about, why not use one of those
serial sniffer things that I know nothing about to record the actual
data that's going through the modem?
I'm assuming here that your aim is to recover the data from the modem
conversation, not to do (say) some form of statistical analysis on the
actual modem signal.
Recovering the data from a modem's audio line would be hard work I
imagine. IIRC modem's use some form of error correction, so a lot of the
data you get is going to be useless (and thus need to be filtered out).
I don't know where modems get their timing signals, but you'd need to
find that out so you could split your audio into "frames" of data. From
there, I'm not sure. I guess if a frame was a byte you could reverse
engineer it well enough by just sending each of the possible 256
characters through it and recording the sound they make, but that's
assuming that it's not interleaved or anything.
So yes, I would say the answer is to do a bit more research. If you
really want to do it this way, then you'll need to basically implement a
modem in software. Perhaps looking at the code for those linmodem
drivers is a good start.
HTH
James.
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